The son of my great grandmother's first cousin to me would be my second cousin once removed.
Your sister's son is your nephew. Your uncle is your nephew's grand uncle or great uncle.
Your great aunt is a sister of one of your grandparentsHer son is a 1st cousin of one of your parentsHer son's son (her grandson) is your 2nd cousinHer son's son's daughter is your 2nd cousin once removed
Your great aunt's son is first cousin to one of your parents, and first cousin once removed to you.
Your nephew is the son of your sibling and a first cousin of your childrenYour grand nephew (or great nephew) is the grandson of your sibling and a second cousin of your grandsonYour great great nephew (or great grand nephew) is the great grandson of your sibling and is a 2nd cousin once removed of your grandson
Your great aunt's son is your parent's first cousin and your first cousin, once removed.
Your great aunt's son is first cousin to one of your parents, and first cousin once removed to you.
Your great grandfather's nephew was your grandfather's first cousin. You are two generations removed from your grandfather and his cousin. Therefore you and your great grandfather's nephew are first cousins, twice removed.
Your great aunt's son is your first cousin once removed. His daughter is your second cousin.
Your aunt's son is your first cousin. Their daughter would be a first cousin once removed.
No. Your grandmother's sister is your great aunt. Her son is first cousin to one of your parents, and your first cousin, once removed.
Your grandmother's sister is your great aunt. Her son is your parent's first cousin and your first cousin, once removed.
Your great aunt's son is your parent's first cousin and your first your cousin, once removed.